Why do not all of my BPM dashboards work on mobile devices ?

Go to the Processes list and select a process.
Go to Gantt Chart and switch to the diagram view.
You cannot navigate to the sub-process by touching the sub-process activity like in a Windows environment.

The disclaimer reads: "Attention Only the Work and Next Task dashboards are responsive and accessible on all devices. The other ready-to-use dashboards are not responsive. They are also not accessible on mobile devices."